Alternating-current dynamo-electric machine

Abstract

An alternating-current dynamoelectric machine according to the present invention includes: a stator including: a stator core in which slots that extend in an axial direction are formed on an inner side; and a stator winding that is mounted to the stator core by winding conducting wires into the slots; and a rotatable rotor including: a field winding that is disposed inside the stator; a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover the field winding and that alternately intermesh with each other; and first and second permanent magnets that are respectively disposed on two facing side surfaces of adjacent claw-shaped magnetic poles and that have magnetic fields that are oriented so as to reduce leakage of magnetic flux between the claw-shaped magnetic poles, and a magnetic body is disposed between a pair of the first and second permanent magnets.

1. An alternating-current dynamoelectric machine comprising:
 a stator including:
 a stator core in which slots that extend in an axial direction are formed on an inner side; and 
 a stator winding that is mounted to said stator core by winding conducting wires into said slots; and 
 
 a rotatable rotor including:
 a field winding that is disposed inside said stator; 
 a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover said field winding and that alternately intermesh with each other; and 
 a permanent magnet that is disposed between two facing side surfaces of adjacent claw-shaped magnetic poles and that has a magnetic field that is oriented so as to reduce leakage of magnetic flux between said claw-shaped magnetic poles, said alternating-current dynamoelectric machine being characterized in that first and second magnetic bodies are respectively disposed on first and second circumferential side surfaces of said permanent magnet, 
 
 wherein each of the first and second magnetic bodies has hexahedron shape, and 
 wherein each of the first and second magnetic bodies are exposed when viewed from an outside in a radial direction. 
 
     
     
       2. An alternating-current dynamoelectric machine according to  claim 1 , wherein said permanent magnet is disposed on said second magnetic body such that a gap forms between said permanent magnet and said first magnetic body and the gap extends parallel to at least one of said first and second circumferential side surfaces. 
     
     
       3. An alternating-current dynamoelectric machine according to  claim 1 , wherein the first and second magnetic bodies respectively directly abut the first and second circumferential side surfaces of same permanent magnet and wherein the first and second magnetic bodies are separate elements. 
     
     
       4. An alternating-current dynamoelectric machine according to  claim 3 , wherein entire side surface of the at least one of the first and second magnetic bodies abuts the at least one of the claw-shaped magnetic poles. 
     
     
       5. An alternating-current dynamoelectric machine according to  claim 1 , wherein the first and second magnetic bodies are at least as wide as the permanent magnet disposed in between. 
     
     
       6. An alternating-current dynamoelectric machine comprising:
 a stator including:
 a stator core in which slots that extend in an axial direction are formed on an inner side; and 
 a stator winding that is mounted to said stator core by winding conducting wires into said slots; and 
 
 a rotatable rotor including:
 a field winding that is disposed inside said stator; 
 a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover said field winding and that alternately intermesh with each other; and 
 a permanent magnet that is disposed between facing first and second side surfaces of adjacent claw-shaped magnetic poles and that has a magnetic field that is oriented so as to reduce leakage of magnetic flux between said claw-shaped magnetic poles, 
 
 wherein said permanent magnet is directly bonded to said first side surface without a magnetic body therein between and a magnetic body is directly bonded to said second side surface without the permanent magnet therein between. 
 
     
     
       7. An alternating-current dynamoelectric machine comprising:
 a stator including:
 a stator core in which slots that extend in an axial direction are formed on an inner side; and 
 a stator winding that is mounted to said stator core by winding conducting wires into said slots; and 
 
 a rotatable rotor including:
 a field winding that is disposed inside said stator; 
 a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover said field winding and that alternately intermesh with each other; and 
 a permanent magnet that is disposed between facing first and second side surfaces of adjacent claw-shaped magnetic poles and that has a magnetic field that is oriented so as to reduce leakage of magnetic flux between said claw-shaped magnetic poles, 
 
 wherein said permanent magnet is directly bonded to said first side surface and a magnetic body is directly bonded to said second side surface, and 
 wherein a gap is disposed parallel to at least one of said side surfaces between said permanent magnet and said magnetic body.